WASHINGTON -- Six investigators conducting security-clearance checks for the federal government have been accused of falsifying reports, authorities say.

The alleged incidents, dating to 2007, involved reports submitted to the Office of Personnel Management, which handles about 90 percent of the background inquiries for more than 100 federal agencies, The Washington Post said.

The reports originated in Connecticut, Maryland and Washington, D.C., and officials said more charges may be forthcoming.

Authorities said they don't believe anyone who didn't deserve a job or security clearance slipped in because of falsified reports. But outside experts voiced concern given the hundreds of new checks under way for incoming Obama administration officials, the Post said.